The Adventure and the Island both have the stated capacity for 350lbs.

However, with the added flotation of the amas I would think one could push that Island capacity up a bit.

One user here had an unfortunate accident with the hull. By the time he realized it, he opened the hatch, only to find that it was filled to the top with water. He managed to sit on and pedal back to shore the hull full of water while supported only by the amas.

A few times My wife and I both were in one Island for sailing. Our combined weight was under 350 and we dit sit kinda low, but sailed just fine.

I'm sure for safety reasons and performance under 350 is the way to go, Just nice to know how much extra "float" the Island has if you need it.